CFGFast: support custom data type guessing handlers.
CFGFast: support custom data type guessing handlers.

tyb0807/angr,axt/angr,angr/angr,iamahuman/angr,axt/angr,chubbymaggie/angr,iamahuman/angr,angr/angr,chubbymaggie/angr,f-prettyland/angr,schieb/angr,schieb/angr,f-prettyland/angr,f-prettyland/angr,tyb0807/angr,chubbymaggie/angr,angr/angr,tyb0807/angr,axt/angr,schieb/angr,iamahuman/angr